Quantum-mechanical calculations for the electron structure of phosphorus-containing sulfides Sn2P2S6 and Tl3PS4

Abstract

The electron structure of phosphorus-containing sulfides Sn2P2S6 and Tl3PS4 is studied experimentally (by means of X-ray spectroscopy) and theoretically (via ab initio band calculations). Partial electronic state densities calculated using the WIEN2k software package correspond to their experimental analogs (the X-ray K- and {vnL}2,3-spectra of P and S). As a result of the greater electronegativity of sulfur, the electron densities of the p- and {pms}-states of P are shifted by approximately 3.5 eV toward lower energies, relative to the similar electronic states of S.